Kassler brown

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Kassler brown
color code: # 554132

Kasslerbraun or Kölnerbraun is an organic brown pigment made from lignite .

As a color it is called juice brown or Van Dyck brown ( pronunciation : [ vanˈdaɪ̯k… ] or [fanˈdaɪ̯k…]); the color is dark coffee brown.

nature

The Kassler Braun is a colorant from brown coal, and consists of humus , and humic acids with proportions of bitumen and manganese . That is why it is also known as Kassel earth . Due to its coloring nature, it is considered a mixed form of pigment and dye and is one of the coloring agents of vegetable origin.

Sometimes referred to as Cologne umber or Cologne earth , it differs from the mineral “real” umber in that it has a much lower specific weight . It smells when heated torfartig and can not unlike Umbra annealed are, but to ashes.

use

Kassler brown is either just ground and slurried on the market or shaped into pieces. The slurried product differs from the raw material in the removed peat . The colorant, which is mostly obtained in open-cast mining , varies greatly in quality. Particularly intense deep brown finds are traded as Van Dyck brown , named after the Flemish painter Anthonis van Dyck , for whose painting style it is typical. For this purpose, such finds are "dissolved" in caustic soda or other "caustic" and the color body is precipitated again as a fine sludge using an acid . This makes the brown carmine or brown ink .

Kassler brown is neither lightfast nor resistant to acids or alkalis and is often unusable for artists. It is hardly used any more, but can be mixed according to Doerner from ivory black and Terra di Siena . It was valued for its excellent glaze ability . It is still used for the production of stains and in wood imitation painting as a dye for beer glaze .

Occurrence

Kassler brown is found in all lignite mining areas , in Germany for example in the area around Cologne , in Bergisch and Jülichschen , in Thuringia or Lusatia .

It was probably used as early as the 16th century; it is characteristic of the Flemish Baroque as a brown ink .

Individual evidence

  1. ↑ Duden | Van Dyck brown. Retrieved January 12, 2018 .
  2. ↑ sRGB (85, 65, 60), from DIN 6164 3: 3: 6 according to Wehlte , Kasslerbraun . P. 130 f.
  3. ↑ M. Doerner (revised by HG Müller): Painting material and its use in pictures . Enke, Stuttgart 1976. - quoted. to Wehlte , Kassler brown . P. 130.

literature

Web links